Finding the Fourth Proportional to 12,105.05, 18,142.52 and 8,589.44

Step by Step Solution

1. Step 1: Write the proportion equation
   12,105.05 : 18,142.52 = 8,589.44 : x
2. Step 2: Convert to fraction form
   12,105.05/18,142.52 = 8,589.44/x
3. Step 3: Cross multiply
   12,105.05x = 18,142.52 × 8,589.44
4. Step 4: Simplify right side
   12,105.05x = 155,834,089.40
5. Step 5: Solve for x
   x = 155,834,089.40/12,105.05
6. Step 6: Final answer
   x = 12,873.48